I've just tried a new build of a Ryzen 3700X on an MSI B450 Tomahawk Max and have come across what appears to be a common problem of getting no video output. I'm in the course of trying various solutions proposed on different forums (having done the obvious things like checking alternative graphics cards). But I wonder if the problem is that the CPU power supply is an 8 pin one and though my power supply (Corsair CX600) also has 4 + 4 connectors, only one module fits the mobo sockets, so I'm trying to run it on just 4 pins. If that is an issue, can I get a cable adapter?